Algodoo

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At Episode 1. Helium Died Because Of The Poison.
Episode 2,Gold Died Because Of [Invaild.Probably Something Hard.]
And Episode 3,Stone Died Because Of The Hammer.

Remaining:
Glass
Steel
Wood
Rubber

Glass­:He Was Setting Food. So I Think He Didn't...or...
Steel And Wood:They Were Placed Near At Table Than Glass...And Alibi.
They Invited In Street. They Won't Attack Them. I Think.
Rubber:Nearest Person At List. (To Grab Poison Tube)
Asleep...?I Think He Was Checking Or Creating About Poison Thing.

Now I'm Looking At The Mystery.
White Plate:I Saw That Thing Sometimes...We Need Hint At Ep1.5 lel

Poison,Invaild,Hammer...It's Hard To Do This. I Have 2 Ideas.

1.Murderer is Rubber. Simply,He Didn't Answer About Prove Alibi.
His Sleeping Was Fake. And Hammer,He Had It. I Think.

2.Murderer "ARE" Glass AND Rubber. They Were Planning About This.
Hammer was one of their item, And Poison. How To Do That?
Probably...Need 2. 2 Of Them. Yeah.
One Of Them Added Poison.

Btw My Brain Going To Be R.I.P

My Final Answer:
Rubber
or
Rubber And Glass

Q.E.D